package com.zhou.shiro;

import com.zhou.annotation.CurrentUser;
import com.zhou.database.UserBean;
import com.zhou.exception.UnauthorizedException;
import org.springframework.core.MethodParameter;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;
import org.springframework.web.multipart.support.MissingServletRequestPartException;

/**
 *  增加方法注入，将含有 @CurrentUser 注解的方法参数注入当前登录用户
 */
public class CurrentUserMethodArgumentResolver implements HandlerMethodArgumentResolver {
    @Override
    public boolean supportsParameter(MethodParameter parameter) {
        return parameter.getParameterType().isAssignableFrom(UserBean.class)
                && parameter.hasParameterAnnotation(CurrentUser.class);
    }

    @Override
    public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {
        UserBean user = (UserBean) webRequest.getAttribute("currentUser", RequestAttributes.SCOPE_REQUEST);
        if (user == null) {
            throw new UnauthorizedException("获取用户信息失败");
        }
        return user;
    }
}
